package com.yuhan.common.utils;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

/**
 * @description: Excel文件导出导入
 * @author: hejing
 * @create: 2019/8/29
 **/
public class ExcelUtils {

    /**
     * Excel文件导出
     *
     * @param list
     * @param title          设置标题
     * @param sheetName      工作表
     * @param pojoClass      实体类
     * @param fileName       文件名
     * @param isCreateHeader 是否创建页眉
     * @param response       处理响应
     */
    public static void exportExcel(List<?> list, String title, String sheetName,
                                   Class<?> pojoClass, String fileName,
                                   boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    /**
     * Excel文件导出
     *
     * @param list
     * @param title     设置标题
     * @param sheetName 工作表
     * @param pojoClass 实体类
     * @param fileName  文件名
     * @param response  处理响应
     */
    public static void exportExcel(List<?> list, String title, String sheetName,
                                   Class<?> pojoClass,
                                   String fileName, HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    /**
     * Excel文件导出
     *
     * @param list
     * @param fileName 文件名
     * @param response 处理响应
     */
    public static void exportExcel(List<Map<String, Object>> list, String fileName,
                                   HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }


    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response,
                                      ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportBigExcel(exportParams, pojoClass, list);
        if (workbook != null) ;
        ExcelExportUtil.closeExportBigExcel();
        downLoadExcel(fileName, response, workbook);
    }

    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null) ;
        downLoadExcel(fileName, response, workbook);
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {

        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
            response.getOutputStream().close();//关闭输出流
        } catch (IOException e) {
            e.printStackTrace();
        }

    }


    /**
     * Excel文件导入
     *
     * @param filePath   导出路径
     * @param titleRows  表格标题行数,默认0
     * @param headerRows 表头行数,默认1
     * @param pojoClass  实体类
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * Excel文件导入
     *
     * @param file
     * @param titleRows  表格标题行数,默认0
     * @param headerRows 表头行数,默认1
     * @param pojoClass  实体类
     * @param <T>
     * @return
     */

    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        if (file == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        } catch (NoSuchElementException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }
}
